Steps to reproduce :
- Create a template with an unclosed wikitable (example) ;
- Include it on another page ;
- Reply with the Reply tool ;
- Refresh ;
- Data corruption: discussions are overwritten by duplication of the unclosed wikitable (see reported bug). It may erase all the wikitext before another wikitable is encountered.
See Help:Lint errors/fostered for context.
Note: I tried without the template and used directly the wikitext of the template, and I could not reproduce the bug (see this rev on my personnal page).